List of top Physics Questions

Two lenses of power $+\, 12 \,D$ and $-2\, D$ are combined together. What is their equivalent focal length ?
The potential energy possessed by a soap bubble, having surface tension equal to $0.04 \,N/m$ of diameter $1\, cm$ is
The dual nature of light is exhibited by
One cannot see through fog, because
Kinetic energy, with any reference, must be
In a vessel, the gas is at a pressure $P$. If the mass of all the molecules is halved and their speed is doubled, then the resultant pressure will be
If a heavy nucleus is split into two medium sized parts, each of the nuclei will have more binding energy per nucleon than the original nucleus. Joining two light nuclei together to give a single nucleus of medium size means more binding energy per nucleon than the two nucleus.
Which of the following has the dimensions of pressure?
The sides of a rectangle are 6.01 m and 12 m. Taking significant figures into account the area of rectangle is
The neutron was discovered by
In a boiling water reactor, the boiling water is used as a
Approximately, the temperature corresponding to 1 eV energy, is
A particle revolves round a circular path. The acceleration of the particle is inversely proportional to
A pure semiconductor has a/an
With an increase in temperature, the electrical conductivity of intrinsic semiconductor
A bulb contains one mole of hydrogen mixed with one mole of oxygen at temperature $T$. The ratio of $r.m.s.$ values of velocity of hydrogen molecules to that of oxygen molecules, is
During paddling of a bicycle, the force of friction exerted by the ground on the two wheels is such that it acts
Two bodies A and B have thermal emissivities of 0.01 and 0.81 respectively. The outer surface areas of the two bodies are the same. The two bodies emit total radiant power at the same rate. The wavelength $\lambda_B$ corresponding to maximum spectral radiancy in the radiation from B shifted from _the wavelength corresponding to maximum spectral radiancy in the radiation from A, by 1.00 pm. If the temperature of A is 5802 K.
A particle of mass $m$ is moving in a circular path of constant radius $r$ such that centripetal acceleration $a_{c}$ varying with time is $a_{c}=k^{2}\, r \,t^{2}$ where $k$ is a constant. What is the power delivered to the particle by the force acting on it?
A sphere collides with another sphere of identical mass. After collision, the two spheres move. The collision is inelastic. Then the angle between the directions of two spheres is
A hollow metallic cylinder is heated. Then its internal diameter
At what height over the earth's pole, the free fall acceleration decreases by $1%$. (Assume the radius of earth to be $6400 km$)
If the gravitational force between two objects were proportional to $ 1/R $ (and not as $ 1/R^2 $ ), where R is the distance between them, then a particle in a circular path (under such a force) would have its orbital speed v, proportional to
A solid spherical ball rolls on a table. Ratio of its rotational kinetic energy to total kinetic energy is
A satellite in force free space sweeps stationary interplanetary dust at a rate of $ dM/dt = \alpha v $ , where M is mass and v is the speed of satellite and $\alpha$ is a constant. The acceleration of satellite is